Suspect Tags` help developers identify performance issues by analyzing user conditions where slow transactions occurred, such as OS, browser type, and connection type. By adding tags, developers can visualize performance groups within transactions, compare performance without noise, and quickly narrow down suspicious tags to focus on the most impactful issues. This feature allows developers to filter out external factors like hardware or battery level, creating a heatmap that highlights user conditions affecting key user bases. With `Suspect Tags`, developers can efficiently identify and fix performance problems that affect their customers the most.